Answered: An asteroid closely passes the Earth at…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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An asteroid closely passes the Earth at a range of 17200mi and a relative speed of 7.8km/s.The diameter is estimated at 30mwith a specific gravity of 3. If this asteroid had impacted Earth, how much energy would have been released? Express this quantity in units of mega-tons (M ton) where a megaton is the energy released by one million metric tons of TNT explosive. A metric ton is 1000kgand the explosive energy density of TNT is 4184J/g.Hint: If the asteroid hits the Earth, its relative velocity becomes zero. Ignore any change in asteroid velocity due to gravitational acceleration or air resistance.

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Problem 3
An asteroid closely passes the Earth at a range of 17200 mi and relative speed of 7.8 km/s.
The diameter is estimated at 30 m with a specific gravity of 3. If this asteroid had impacted
Earth, how much energy would have been released? Express this quantity in units of mega-
tons (Mton) where a megaton is the energy released by one million metric tons of TNT
explosive. A metric ton is 1000 kg and the explosive energy density of TNT is 4184 J/g.
Hint: If the asteroid hits the Earth, its relative velocity becomes zero. Ignore any change in
asteroid velocity due to gravitational acceleration or air resistance.
Problem 4
You are designing a heat recovery system for a new autonomous Mars rover. The system
currently uses freon as the heat transfer fluid. The system must maintain an instrumentation
temperature of at least 67°F in an environment of 189 K. If the system needs to move
47.4 BTU, what volume of working fluid is needed in units of L? Note that freon has a
specific gravity of 1.49, a molecular mass of 120 g/mol, and a specific heat of 74 J/(molK).

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